下面有几种做法,  其中3之简洁令人惊讶. 

 

1, 

>>> t = [1, 2, 3, 1, 2, 5, 6, 7, 8]>>> t[1, 2, 3, 1, 2, 5, 6, 7, 8]>>> list(set(t))[1, 2, 3, 5, 6, 7, 8]>>> s = [1, 2, 3] >>> list(set(t) - set(s)) [8, 5, 6, 7]

 2, 

def f7(seq):    seen = set()    seen_add = seen.add    return [x for x in seq if not (x in seen or seen_add(x))]

 3, 

myList = sorted(set(myList))

 4, 

for i in mylist:  if i not in newlist:    newlist.append(i)